Quick release chuck



Aug.. L 1950 K E. QUEITZSCH 2,517,346

QUICK RELEASE CHUCK Filed Nov. 26, 1946 M f/ 'l fig, 4 w @muy Patented Aug. 1, 1950 UNITED STATES; PATENT FFIC.E-M i 2,517,346 Y I `1 QUICKfRELEASECHUCK Karl Et QueitzschYork; Pa.

Application November 26, 1946;" Serial No. '712;447I

ZJCIaims.' (Cl. 279-74) v l i 2: f This-invention relates to lathe tools andlmore' berbelng adapted to be threadedly `secured by particularly to a chuckldeviceemployedtosecure internal threads 20 to the headfstock l spindle ofi and.) accurately center i bar stock orV anyfshort the lathe; Between chuck` member IQ'andbearwornfpiece to 4the iatnefhead stock; for -turning ngfsegrnents la, lsl a bushing 2l haviflgend"` operations on saidrbarstock orshort work pieces. anges 13|, Sl engaging `thesidcs `of the Segments A main object of-the invention is to provide andwhich isurotatable with respect tot'hesega:novel and improved chuck device adapted to ments'. F'langed hushilgrfl!"iSlOIlgiuClhallYSlid-` release or secure accurately bar stock or short able 0n Chuck member I9 whichiSproVid-ed With workpieces'whiletheilathespindle is rotating at a plurality of radial grippingpins* which are of turning` speed, Said" chuck device i being very any suitable cross-sectional shape, such as round, simple instructure, easytooperateandproviding Square, Gr rectangular, ShOWrl` at 22- Slidably rapid `engaging and releasing action withrespect 111011111166. in radial bOIeS formed Il `the chuck` to the `bar being" turned, member; Pins 22 'project Slightly beyond the` Akfurtherobjectoftthe invention-fisio provide Outer periphery 0f Chuck member IST asshownr animprovedchuckdevlcefoi' lathe operations 15 at 23 S0` that SadlJhS may be OIGedlIlWardlYf' on bar stock, said device being-veryysturdy in @by eneaeementwith theinner surface of hanged* construction, easy toinstall andprovding a` reli-,` buShngZI as said bushing SiS mOi/ed rearwardly? able` gripping` action gnltheibarstbck; yet being on chuck member IQ. The inward movementof quickly engageable and releasable `with,"respect Din522 DIOVdeS a firm gripping action OnaWOrk thereto. i piece 241 fed' axially through the head1 stoclr` Furtherobjectslandadvantagesof the-invnilfi'sleihdleOf the lathe u Y u tion will becomes apparent from the 'followingg Chuck member I9 1S`f0r1-1ed filth an aXlalrend description and claims, and from the accompany: OIJEIllIlg 25 Shghtly larger 1n dlameter than the ing drawings, wherein:` work piece 24- and is flangedl at 25 to` prevent y Figure 1 is a front elevational View of a chuck 2;, bushing '2l `f10m being mOi/edrearwaldly Offl'fl` device according to the present `imfenfoii achuck member when no workpieceisfheld inthe Figurezisa sideelevationallview` of the chuck Chllk- The `Dills 22 are reCeSSBd and flattehfdi device of Figure l showing a piece fof bar stock ati 2T and are engaged by machine `SCreWS`28 at" engaged therewith. said flattened portions 1 which prevent the pins,`

Figure 3 is an enlarged vertical cross-sectionalmw ,from turning yet permit said pins" to be moved view taken through the chuckzdevice of Figure l. """V'throughthe required radial distances for grip--` Figure 4 is `a cross-sectional"` detail viewrtaken ping the workpiece. on linea-#aci Figure `3: 1 The horizontal pivots Il',` il permit'the bearing Figure 5`iis a detail cross-sectional Viewtaken segments I8,` I8 to adjust themselves with respect on line 5-5 of Figure 4'. 35 to` frame` IE so as tomove parallel Awith ,respect Referring to thedrawingsl Iidesignates a base rito chuck member la as handleA I`5 is rotated" member adapted to be secured to a lathe bettfor,` through a substantial arc, such as is indicatedin Wardlyadjacent to and inverticalalignmentwith Figure 2. Ina substantially vertical position ci."` the" head stock spindle of the lathe. Threaded Said` handle `bushingZI ehgageShePiDS 22 700mm. into base member II is a vertical post member 40 them` inwardly to grip the work piece so as to I2 having a bifurcated head D0r'i0h |3 PVOtally center the work piece with respect to the spindle. secured in head portion I3 for swinging move- By moving the handle to the left, as viewed in ment in the vertical longitudinal plane of the Figure 3, bushing 2| may be quickly disengaged spindle is an arm I4. Secured to arm I4 is a from pins 22 to release the work piece while circular frame member I6 which is substantially 45 the spindle is rotating at operating speed. A new concentric with the spindle axis and located in work piece may then be inserted through the a transverse vertical plane with respect thereto. spindle and through the opening 25, and by mov- Secured to the top of frame I6 is a handle meming handle I5 back to a position wherein bushing ber I5 which is substantially in alignment with 2| engages pins 22, the new work piece may be arm I4. quickly secured in the chuck for lathe operations Pivotally secured in the respective side portions therein. of frame I6 by horizontal bolts I1, l1 are a pair Pins 22 are concave at their gripping ends, as of semi-circular bearing segments I8, I8. Roshown at 29 in Figure 4, to conform with the tatably positioned in bearing segments I8, I8 is cylindrical contour of round bar stock. Said a cylindrical chuck member I9, said chuck memconcave ends interlock with the bar stock to aid handle l5 in either of the directions from vertical n indicated in Figure 2.

Although intended mainly for use with round stock, the chuck device may obviously be employed with stock of non-circular cross-section, such as hexagonal, octagonal, and the like. Any cross-sectional size or diameter of bar stock mai be employed up to the largest size which can be accommodated in the hole through the spindle.

i While a specific embodiment of a quick-releasing lathe chuck has been disclosed in the foregoing description, it will be understood that various modifications within the spirit of the invention may occur to those skilled in the art` Therefore, it is intended that no limitations be placed on the invention other than as defined by the scope ofthe appended claims.

-What is claimed is:

Vl. A chuck device for use upon a lathe having a bed 'and a rotatable screw threaded spindle, said device comprising an upright post for securement to the bed of the lathe, an elongated generally upright handle pivotally secured to the top of the post for swinging movement in a vertical plane and longitudinally of the spindle, an annular ring connected in the handle and having its axis substantially coinciding with the longitudinal axis of the spindle, arcuate bearing segments pivotally secured within the bore of the annular ring and held against rotation, the bearing segments being swingable vertically with respect to the annular ring to a limited extent, a freely rotatable bushing journaled within the bearing segments and held against axial movement with respect to the segments and having a cylindrical bore which is ilared at one end of the bushing for forming a cam surface, a substantially cylindrical chuck head mounted within the bore of the bushing for rotation with the bushing and provided in one end with an internally screw threaded recess for receiving the screw threaded spindle of the lathe, the chuck head rotating with the spindle of the lathe, the chuck head being provided near its opposite end withv a plurality of circumferentially spaced radial openings, radially shiftable gripping pins mounted Within the radial openings and projecting radially beyond the periphery of the chuck head for engagement with the cam surface of the bushing when the upright handle is swung vertically to force the gripping pins radially inwardly, and a stop secured to the chuck head for engagement with the bushing to limit the relative axial movement of the bushing and chuck head.

2. A chuck device for use upon a lathe having a rotatable screw threaded spindle and a lathe bed, the device comprising an elongated upstanding handle pivotally connected with the lathe bed for limited Vertical swinging movement longitudinally of the spindle axis, an annular ring connected in the handle and having its axis substantially coinciding with the longitudinal axis of the spindle, arcuate bearing segments pivotally mounted Within the annular ring, a

spindle for rotation therewith,the bushing being axially shiftable upon the chuck head when the handle `is swungin either direction, the chuck head having a` plurality of circumferentially spaced radial openings formed therein near its end remote from the lathe spindle, the end of the chuck-head remote from the lathe spindle being provided with an annular radial flange forming a shoulder, and a plurality of radially shiftable gripping pins slidably mounted within the radial openings of the chuck head and projectingv radially beyond kthe periphery of the chuck head for engagement with the cam surface of the ybushing when the bushing is ,shifted ,axially in one direction by the handle, the

shoulder of the chuck head limiting the axial Jlniting movement of the bushing in such direc- KARL E. QUEITZSCH. REFERENCES CITED The following references are of record in the file of this patent:

y UNITED STATES PA'I'ENTS Number,

Name Date 545,312 Rivett Aug. 27, 1895 1,410,612 Sherman Mar. 28, 1922 1,864,786 Wilkins June 28, 1932 2,403,100 Geren July 2, 1946 FoREIcnI PATENTS v Number y Country Date Germany of 1936 

